IBM TS2340 User Guide - Page 52
Automatic Cartridge Facility Mode, Special Files, Special Files for Tape Devices
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AIX Device Driver (Atape) Notes: 1. The tape position must be at the start of the tape to change this parameter from its current value. 2. Attempting to set logical write protect that is not supported by a device or the current media loaded always returns ″No″ and cannot be changed. Volume ID for Logging This parameter is the volume ID of the current loaded tape. It is used in the log file entry (if volume logging is active) to identify the entry with a particular volume. The device driver sets the volume ID to UNKNOWN initially and when the tape is unloaded. Automatic Cartridge Facility Mode If the IBM TotalStorage Enterprise Tape System 3590 or Magstar MP tape subsystem has an ACF installed, then the ACF mode can be queried by the tapeutil application using the Query/Set Parameters option in the window. Note: ITDT does not support the IBM TotalStorage Enterprise Tape System 3590. See "AIX System - Tape Utility Program (tapeutil)" on page 362 for information on the tapeutil application. Special Files Once the driver is installed and a tape device is configured and available for use, access is provided through the special files. These special files, which consist of the standard AIX special files for tape devices (with other files unique to the Atape driver), are in the /dev directory. Special Files for Tape Devices Each tape device has a set of special files that provides access to the same physical drive but to different types of functions. As shown in Table 6, in addition to the tape special files, a special file is provided for tape devices that allows access to the medium changer as a separate device. Note: The asterisk (*) represents a number assigned to a particular device (such as rmt0). For tape drives with attached SCSI medium changer devices, the rmt*.smc special file provides a separate path for issuing commands to the medium changer. When this special file is opened, the application can view the medium changer as a separate SCSI device. Both this special file and the rmt* special file can be opened at the same time. The file descriptor that results from opening the rmt*.smc special file does not support the following operations: v Read v Write v Open in Diagnostic mode v Commands designed for a tape drive If a tape drive has a SCSI medium changer device attached, then all operations (including the medium changer operations) are supported through the interface to the rmt* special file. For detailed information, refer to Table 6 on page 35. 34 IBM Tape Device Drivers Installation and User's Guide
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